What is the required action when connecting a standby gas supply to the main gas meter?

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When connecting a standby gas supply to the main gas meter, installing a three-way valve is essential for ensuring safe and efficient operation. A three-way valve allows for the easy switching between the primary gas supply and the standby supply without disrupting the gas flow to the system. This is particularly important in situations where the main supply might fail, as it provides a secure method to transition to the backup without risking backflow or incorrect gas flow routes.

The design of a three-way valve also helps to prevent cross-contamination between gas supplies, ensuring that only the appropriate gas is delivered to the system at any given time. This adheres to safety codes and regulations, which mandate that standby systems be adequately isolated from the main supply to mitigate the risk of gas leaks or other safety hazards.

The other options are less effective for this situation. A single pipe connection does not provide the necessary control over gas flow, while a check valve may allow for backflow in some configurations and is generally used to prevent reverse flow rather than facilitate switching between supplies. Bypassing the main meter entirely could lead to regulatory violations and is not a recommended practice for ensuring accurate billing and monitoring of gas usage.

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